CLEVELAND, Ohio -- Rookie Browns cornerback Denzel Ward sat out the second day of the three-day rookie minicamp practice Saturday with a hip flexor, and fourth-round receiver Antonio Callaway left midway through practice with a toe injury.

Ward was idled for precautionary reasons, Jackson said.

The severity of Callaway's injury is unknown. He had his left shoe off on the sidelines and was checked by a trainer before walking into the facility gingerly. It happened during a one-on-one drill and he never made it to the 11-on-11s.

Before the injury, he caught several long and intermediate passes, but also dropped a deep ball from Baker Mayfield.

Ward left midway through the first practice on Friday after feeling something in the hip.

"It's just precautionary,'' he said through the team's media relations department. "I wish I was out there with my guys but the training staff is being smart about it. I should be back soon.''

A red flag went up on Ward during one-on-one drills on Friday when he was covering receiver Tony Morris of Fairborn, Ohio, from Heidelberg. Morris got behind Ward for a deep reception, which was surprising considering Ward tied for the fastest 40 time at the NFL combine in March at 4.32 seconds.

During Saturday's practice, Ward rode the stationery bike and worked off to the side with the trainers. Jackson said he was being extra careful at this time of year, which is more about installation and learning the Browns' way of doing things.

"I'm always going to be cautious with our guys if I think they have a little nick or something,'' Jackson said. "I don't think being out here and having a guy, if there's anything that we feel that might hurt a guy, I'm going to make sure I take him out."